>Studies have also shown that people who don’t smoke but have a family history of lung cancer, such as Ms. Chen and Ms. Liu — both of Ms. Liu’s grandfathers had

>Studies have also shown that people who don’t smoke but have a family history of lung cancer, such as Ms. Chen and Ms. Liu — both of Ms. Liu’s grandfathers had the disease — are at increased risk. This could be because of shared genetics, a common environment or both, said Dr. Jae Kim, chief of thoracic surgery at City of Hope in Duarte, Calif. Couldn't this be secondhand smoke?